topaz, n. [OE. topas, F. topaze, L. topazos, or topazion, a kind of precious stone, Gr. to`pazos, topa`zion; possibly akin to Skr. tap to glow (cf. Tepid). According to some, the name is from Topazos, a small island in the Red Sea, where the Romans obtained a stone which they called by this name, but which is the chrysolite of the moderns.].

A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem. [1913 Webster]
Either one of two species of large, brilliantly colored humming birds of the genus Topaza (Topaza pella or Topaza pyra), of South America and the West Indies. [1913 Webster]
" The two tail feathers next to the central ones are much longer that the rest, curved, and crossed. The Throat is metallic yellowish-green, with a tint like topaz in the center, the belly is bright crimson, the back bright red. Called also topaz hummer." [1913 Webster]

False topaz. (Min.) See the Note under Quartz.

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OXFORD DICTIONARY

topaz, n.
1 a transparent or translucent aluminium silicate mineral, usu. yellow, used as a gem.
2 any South American humming-bird of the genus Topaza.

Etymology

ME f. OF topace, topaze f. L topazus f. Gk topazos

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ROGET THESAURUS

topaz

Yellowness

N yellowness, yellow, or, gamboge, cadmium-yellow, chrome-yellow, Indian-yellow king's-yellow, lemonyellow, orpiment, yellow ocher, Claude tint, aureolin, xanthein, xanthin, zaofulvin, crocus, saffron, topaz, xanthite, yolk, jaundice, London fog, yellowness, icterus, xantho- cyanopia, xanthopsia, yellow, aureate, golden, flavous, citrine, fallow, fulvous, fulvid, sallow, luteous, tawny, creamy, sandy, xanthic, xanthous, jaundiced, auricomous, gold-colored, citron-colored, saffron-colored, lemon-colored, lemon yellow, sulphur-colored, amber-colored, straw-colored, primrose- colored, creamcolored, xanthocarpous, xanthochroid, xanthopous, yellow as a quince, yellow as a guinea, yellow as a crow's foot, warm, advancing.

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